My computer is fairly new except for the hard drives. I recently replaced the motherboard, cpu, and power supply, but not the hard drives. All of the hard drives in my computer are fairly old and some I even bought used so I think they might be about to fail.
Whenever I walk away from my computer and come back after 10 or 20 minutes the computer freezes several seconds after the monitor turns on. I have enough time to move my mouse around a little bit before it becomes completely unresponsive.
I should mention that I set my computer so that nothing goes into standby in the Windows settings including the hard drives.